[INFO] cloning repository https://github.com/modulitos/CtCI-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/modulitos/CtCI-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmodulitos%2FCtCI-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmodulitos%2FCtCI-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 8bbaa49c3eca43a77cf1a2cea1b6f98071ad2c78
[INFO] documenting modulitos/CtCI-rust against beta-2022-05-20 for beta-1.62-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmodulitos%2FCtCI-rust" "/workspace/builds/worker-29/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-29/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/modulitos/CtCI-rust on toolchain beta-2022-05-20
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-05-20" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/modulitos/CtCI-rust
[INFO] finished tweaking git repo https://github.com/modulitos/CtCI-rust
[INFO] tweaked toml for git repo https://github.com/modulitos/CtCI-rust written to /workspace/builds/worker-29/source/Cargo.toml
[INFO] crate git repo https://github.com/modulitos/CtCI-rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-05-20" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-29/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-29/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-05-20" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0d7a8da288cca3cc1917a2ceffd8b9c483f0c5a92d187aff7fd07a190413b3f6
[INFO] running `Command { std: "docker" "start" "-a" "0d7a8da288cca3cc1917a2ceffd8b9c483f0c5a92d187aff7fd07a190413b3f6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0d7a8da288cca3cc1917a2ceffd8b9c483f0c5a92d187aff7fd07a190413b3f6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0d7a8da288cca3cc1917a2ceffd8b9c483f0c5a92d187aff7fd07a190413b3f6", kill_on_drop: false }`
[INFO] [stdout] 0d7a8da288cca3cc1917a2ceffd8b9c483f0c5a92d187aff7fd07a190413b3f6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-29/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-29/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-05-20" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 226494b560d4a066ef519030bcd20dd223d316d4296a779f9771265eb0bdf5ea
[INFO] running `Command { std: "docker" "start" "-a" "226494b560d4a066ef519030bcd20dd223d316d4296a779f9771265eb0bdf5ea", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.60
[INFO] [stderr]    Compiling memchr v2.2.1
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]     Checking cfg-if v0.1.9
[INFO] [stderr]     Checking ppv-lite86 v0.2.5
[INFO] [stderr]    Compiling lazy_static v1.3.0
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling regex-syntax v0.6.12
[INFO] [stderr]    Compiling thread_local v0.3.6
[INFO] [stderr]     Checking c2-chacha v0.2.2
[INFO] [stderr]    Compiling aho-corasick v0.7.6
[INFO] [stderr]     Checking getrandom v0.1.7
[INFO] [stderr]    Compiling quote v0.6.13
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_chacha v0.2.1
[INFO] [stderr]     Checking rand v0.7.2
[INFO] [stderr]    Compiling regex v1.3.1
[INFO] [stderr]    Compiling derive_more v0.15.0
[INFO] [stderr]     Checking rust-solutions v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]  Documenting rust-solutions v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> src/linked_list/second.rs:11:27
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub type Link<T> = Option<(Box<Node<T>>)>;
[INFO] [stdout]    |                           ^            ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 11 - pub type Link<T> = Option<(Box<Node<T>>)>;
[INFO] [stdout] 11 + pub type Link<T> = Option<Box<Node<T>>>;
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::List`
[INFO] [stdout]    --> src/linked_list/second.rs:167:9
[INFO] [stdout]     |
[INFO] [stdout] 167 |     use super::List;
[INFO] [stdout]     |         ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::HashSet`
[INFO] [stdout]  --> src/linked_list/third.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::collections::HashSet;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::HashSet`
[INFO] [stdout]  --> src/linked_list/fifth.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::collections::HashSet;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::HashSet`
[INFO] [stdout]  --> src/linked_list/refcell_singly.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::collections::HashSet;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::*`
[INFO] [stdout]    --> src/stack.rs:115:9
[INFO] [stdout]     |
[INFO] [stdout] 115 |     use super::*;
[INFO] [stdout]     |         ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::*`
[INFO] [stdout]    --> src/binary_search_tree.rs:124:9
[INFO] [stdout]     |
[INFO] [stdout] 124 |     use super::*;
[INFO] [stdout]     |         ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Ord`, `Ordering`
[INFO] [stdout]  --> src/graph.rs:1:16
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::cmp::{Ord, Ordering};
[INFO] [stdout]   |                ^^^  ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> src/linked_list/second.rs:11:27
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub type Link<T> = Option<(Box<Node<T>>)>;
[INFO] [stdout]    |                           ^            ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 11 - pub type Link<T> = Option<(Box<Node<T>>)>;
[INFO] [stdout] 11 + pub type Link<T> = Option<Box<Node<T>>>;
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::*`
[INFO] [stdout]    --> src/graph.rs:178:9
[INFO] [stdout]     |
[INFO] [stdout] 178 |     use super::*;
[INFO] [stdout]     |         ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::*`
[INFO] [stdout]   --> src/binary_tree.rs:43:9
[INFO] [stdout]    |
[INFO] [stdout] 43 |     use super::*;
[INFO] [stdout]    |         ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::*`
[INFO] [stdout]   --> src/binary_tree_refcell.rs:51:9
[INFO] [stdout]    |
[INFO] [stdout] 51 |     use super::*;
[INFO] [stdout]    |         ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::*`
[INFO] [stdout]    --> src/binary_search_tree_refcell.rs:128:9
[INFO] [stdout]     |
[INFO] [stdout] 128 |     use super::*;
[INFO] [stdout]     |         ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/linked_list/second.rs:67:12
[INFO] [stdout]    |
[INFO] [stdout] 67 |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `into_iter`
[INFO] [stdout]   --> src/linked_list/second.rs:71:12
[INFO] [stdout]    |
[INFO] [stdout] 71 |     pub fn into_iter(self) -> IntoIter<T> {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `iter`
[INFO] [stdout]   --> src/linked_list/second.rs:76:12
[INFO] [stdout]    |
[INFO] [stdout] 76 |     pub fn iter(&self) -> Iter<T> {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `iter_mut`
[INFO] [stdout]   --> src/linked_list/second.rs:84:12
[INFO] [stdout]    |
[INFO] [stdout] 84 |     pub fn iter_mut(&mut self) -> IterMut<'_, T> {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `push`
[INFO] [stdout]   --> src/linked_list/second.rs:90:12
[INFO] [stdout]    |
[INFO] [stdout] 90 |     pub fn push(&mut self, elem: T) {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `peek`
[INFO] [stdout]    --> src/linked_list/second.rs:119:12
[INFO] [stdout]     |
[INFO] [stdout] 119 |     pub fn peek(&self) -> Option<&T> {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `peek_mut`
[INFO] [stdout]    --> src/linked_list/second.rs:123:12
[INFO] [stdout]     |
[INFO] [stdout] 123 |     pub fn peek_mut(&mut self) -> Option<&mut T> {
[INFO] [stdout]     |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/linked_list/third.rs:21:12
[INFO] [stdout]    |
[INFO] [stdout] 21 |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `append`
[INFO] [stdout]   --> src/linked_list/third.rs:25:12
[INFO] [stdout]    |
[INFO] [stdout] 25 |     pub fn append(&mut self, elem: T) -> Self {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `tail`
[INFO] [stdout]   --> src/linked_list/third.rs:35:12
[INFO] [stdout]    |
[INFO] [stdout] 35 |     pub fn tail(&self) -> Self {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `head`
[INFO] [stdout]   --> src/linked_list/third.rs:40:12
[INFO] [stdout]    |
[INFO] [stdout] 40 |     pub fn head(&self) -> Option<&T> {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `iter`
[INFO] [stdout]    --> src/linked_list/third.rs:107:12
[INFO] [stdout]     |
[INFO] [stdout] 107 |     pub fn iter(&self) -> Iter<'_, T> {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/linked_list/fourth.rs:19:8
[INFO] [stdout]    |
[INFO] [stdout] 19 |     fn new(elem: T) -> Rc<RefCell<Self>> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/linked_list/fourth.rs:29:12
[INFO] [stdout]    |
[INFO] [stdout] 29 |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `push_front`
[INFO] [stdout]   --> src/linked_list/fourth.rs:35:12
[INFO] [stdout]    |
[INFO] [stdout] 35 |     pub fn push_front(&mut self, elem: T) {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `peek_front`
[INFO] [stdout]   --> src/linked_list/fourth.rs:76:12
[INFO] [stdout]    |
[INFO] [stdout] 76 |     pub fn peek_front(&self) -> Option<Ref<T>> {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `prev`
[INFO] [stdout]   --> src/linked_list/brandon.rs:25:5
[INFO] [stdout]    |
[INFO] [stdout] 25 |     prev: Option<NodeRef<T>>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `tail`
[INFO] [stdout]   --> src/linked_list/brandon.rs:39:8
[INFO] [stdout]    |
[INFO] [stdout] 39 |     fn tail(node: &NodeRef<T>) -> Option<NodeRef<T>> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `remove`
[INFO] [stdout]   --> src/linked_list/brandon.rs:46:8
[INFO] [stdout]    |
[INFO] [stdout] 46 |     fn remove(&mut self) {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/linked_list/brandon.rs:64:8
[INFO] [stdout]    |
[INFO] [stdout] 64 |     fn new() -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `append`
[INFO] [stdout]   --> src/linked_list/brandon.rs:68:8
[INFO] [stdout]    |
[INFO] [stdout] 68 |     fn append(&mut self, new_value: T) {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `tail`
[INFO] [stdout]   --> src/linked_list/brandon.rs:85:8
[INFO] [stdout]    |
[INFO] [stdout] 85 |     fn tail(&self) -> Option<NodeRef<T>> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `iter`
[INFO] [stdout]   --> src/linked_list/brandon.rs:96:8
[INFO] [stdout]    |
[INFO] [stdout] 96 |     fn iter(&self) -> Iter<T> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `list_has_duplicates`
[INFO] [stdout]    --> src/linked_list/brandon.rs:102:8
[INFO] [stdout]     |
[INFO] [stdout] 102 |     fn list_has_duplicates(&self) -> bool {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `remove_duplicates`
[INFO] [stdout]    --> src/linked_list/brandon.rs:117:8
[INFO] [stdout]     |
[INFO] [stdout] 117 |     fn remove_duplicates(&mut self) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]    --> src/linked_list/brandon.rs:228:4
[INFO] [stdout]     |
[INFO] [stdout] 228 | fn main() {
[INFO] [stdout]     |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `tail`
[INFO] [stdout]  --> src/linked_list/fifth.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     tail: *mut Node<T>, // DANGER - raw pointer
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout] note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]  --> src/linked_list/fifth.rs:6:10
[INFO] [stdout]   |
[INFO] [stdout] 6 | #[derive(Debug)]
[INFO] [stdout]   |          ^^^^^
[INFO] [stdout]   = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/linked_list/fifth.rs:24:12
[INFO] [stdout]    |
[INFO] [stdout] 24 |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `push`
[INFO] [stdout]   --> src/linked_list/fifth.rs:31:12
[INFO] [stdout]    |
[INFO] [stdout] 31 |     pub fn push(&mut self, elem: T) {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `pop`
[INFO] [stdout]   --> src/linked_list/fifth.rs:53:12
[INFO] [stdout]    |
[INFO] [stdout] 53 |     pub fn pop(&mut self) -> Option<T> {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 42 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not document `rust-solutions`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name ch7_p1_deck_of_cards src/bin/ch7-p1_deck-of-cards.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items '-Arustdoc::private-intra-doc-links' -C metadata=e7fa6db0e3fc7feb -L dependency=/opt/rustwide/target/debug/deps --extern derive_more=/opt/rustwide/target/debug/deps/libderive_more-de38e6bfcf24a584.so --extern rand=/opt/rustwide/target/debug/deps/librand-660afc33a0845390.rmeta --extern cracking=/opt/rustwide/target/debug/deps/libcracking-1f684f2b9e12d9be.rmeta --cap-lints=warn --crate-version 0.1.0` (signal: 9, SIGKILL: kill)
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not document `rust-solutions`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name ch2_p8_loop_detection src/bin/ch2-p8_loop-detection.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items '-Arustdoc::private-intra-doc-links' -C metadata=f3cec8a7f3c52c28 -L dependency=/opt/rustwide/target/debug/deps --extern derive_more=/opt/rustwide/target/debug/deps/libderive_more-de38e6bfcf24a584.so --extern rand=/opt/rustwide/target/debug/deps/librand-660afc33a0845390.rmeta --extern cracking=/opt/rustwide/target/debug/deps/libcracking-1f684f2b9e12d9be.rmeta --cap-lints=warn --crate-version 0.1.0` (signal: 9, SIGKILL: kill)
[INFO] [stderr] error: could not document `rust-solutions`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name ch3_p3_stack_of_plates src/bin/ch3-p3_stack-of-plates.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items '-Arustdoc::private-intra-doc-links' -C metadata=7f78ff19c55365bc -L dependency=/opt/rustwide/target/debug/deps --extern derive_more=/opt/rustwide/target/debug/deps/libderive_more-de38e6bfcf24a584.so --extern rand=/opt/rustwide/target/debug/deps/librand-660afc33a0845390.rmeta --extern cracking=/opt/rustwide/target/debug/deps/libcracking-1f684f2b9e12d9be.rmeta --cap-lints=warn --crate-version 0.1.0` (signal: 9, SIGKILL: kill)
[INFO] [stderr] error: could not document `rust-solutions`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name ch1_p9_string_rotation src/bin/ch1-p9_string-rotation.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items '-Arustdoc::private-intra-doc-links' -C metadata=2585adc7c3eda3f3 -L dependency=/opt/rustwide/target/debug/deps --extern derive_more=/opt/rustwide/target/debug/deps/libderive_more-de38e6bfcf24a584.so --extern rand=/opt/rustwide/target/debug/deps/librand-660afc33a0845390.rmeta --extern cracking=/opt/rustwide/target/debug/deps/libcracking-1f684f2b9e12d9be.rmeta --cap-lints=warn --crate-version 0.1.0` (signal: 9, SIGKILL: kill)
[INFO] [stderr] error: could not document `rust-solutions`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name ch7_p3_jukebox src/bin/ch7-p3_jukebox.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items '-Arustdoc::private-intra-doc-links' -C metadata=123bd5053909c100 -L dependency=/opt/rustwide/target/debug/deps --extern derive_more=/opt/rustwide/target/debug/deps/libderive_more-de38e6bfcf24a584.so --extern rand=/opt/rustwide/target/debug/deps/librand-660afc33a0845390.rmeta --extern cracking=/opt/rustwide/target/debug/deps/libcracking-1f684f2b9e12d9be.rmeta --cap-lints=warn --crate-version 0.1.0` (signal: 9, SIGKILL: kill)
[INFO] [stderr] error: could not document `rust-solutions`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name ch1_p7_rotate_matrix src/bin/ch1-p7_rotate-matrix.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items '-Arustdoc::private-intra-doc-links' -C metadata=f100f4cae94fa89c -L dependency=/opt/rustwide/target/debug/deps --extern derive_more=/opt/rustwide/target/debug/deps/libderive_more-de38e6bfcf24a584.so --extern rand=/opt/rustwide/target/debug/deps/librand-660afc33a0845390.rmeta --extern cracking=/opt/rustwide/target/debug/deps/libcracking-1f684f2b9e12d9be.rmeta --cap-lints=warn --crate-version 0.1.0` (signal: 9, SIGKILL: kill)
[INFO] [stderr] error: could not document `rust-solutions`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name ch4_p3_list_of_depths src/bin/ch4-p3_list-of-depths.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items '-Arustdoc::private-intra-doc-links' -C metadata=fa424d6ab4e40589 -L dependency=/opt/rustwide/target/debug/deps --extern derive_more=/opt/rustwide/target/debug/deps/libderive_more-de38e6bfcf24a584.so --extern rand=/opt/rustwide/target/debug/deps/librand-660afc33a0845390.rmeta --extern cracking=/opt/rustwide/target/debug/deps/libcracking-1f684f2b9e12d9be.rmeta --cap-lints=warn --crate-version 0.1.0` (signal: 9, SIGKILL: kill)
[INFO] [stderr] error: could not document `rust-solutions`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name ch3_p6_animal_shelter src/bin/ch3-p6_animal-shelter.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items '-Arustdoc::private-intra-doc-links' -C metadata=2a47dd5e7dde395c -L dependency=/opt/rustwide/target/debug/deps --extern derive_more=/opt/rustwide/target/debug/deps/libderive_more-de38e6bfcf24a584.so --extern rand=/opt/rustwide/target/debug/deps/librand-660afc33a0845390.rmeta --extern cracking=/opt/rustwide/target/debug/deps/libcracking-1f684f2b9e12d9be.rmeta --cap-lints=warn --crate-version 0.1.0` (signal: 9, SIGKILL: kill)
[INFO] [stderr] error: could not document `rust-solutions`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name ch3_p2_stack_with_min src/bin/ch3-p2_stack-with-min.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items '-Arustdoc::private-intra-doc-links' -C metadata=5c05ecd48ae59592 -L dependency=/opt/rustwide/target/debug/deps --extern derive_more=/opt/rustwide/target/debug/deps/libderive_more-de38e6bfcf24a584.so --extern rand=/opt/rustwide/target/debug/deps/librand-660afc33a0845390.rmeta --extern cracking=/opt/rustwide/target/debug/deps/libcracking-1f684f2b9e12d9be.rmeta --cap-lints=warn --crate-version 0.1.0` (signal: 9, SIGKILL: kill)
[INFO] [stderr] error: could not document `rust-solutions`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name ch1_p6_string_compression src/bin/ch1-p6_string-compression.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items '-Arustdoc::private-intra-doc-links' -C metadata=a33b2ff66626d03f -L dependency=/opt/rustwide/target/debug/deps --extern derive_more=/opt/rustwide/target/debug/deps/libderive_more-de38e6bfcf24a584.so --extern rand=/opt/rustwide/target/debug/deps/librand-660afc33a0845390.rmeta --extern cracking=/opt/rustwide/target/debug/deps/libcracking-1f684f2b9e12d9be.rmeta --cap-lints=warn --crate-version 0.1.0` (signal: 9, SIGKILL: kill)
[INFO] [stderr] error: could not document `rust-solutions`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name ch1_p5_one_away src/bin/ch1-p5_one-away.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items '-Arustdoc::private-intra-doc-links' -C metadata=7572299641b46ef2 -L dependency=/opt/rustwide/target/debug/deps --extern derive_more=/opt/rustwide/target/debug/deps/libderive_more-de38e6bfcf24a584.so --extern rand=/opt/rustwide/target/debug/deps/librand-660afc33a0845390.rmeta --extern cracking=/opt/rustwide/target/debug/deps/libcracking-1f684f2b9e12d9be.rmeta --cap-lints=warn --crate-version 0.1.0` (signal: 9, SIGKILL: kill)
[INFO] [stderr] error: could not document `rust-solutions`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name ch5_p4_next_number src/bin/ch5-p4_next-number.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items '-Arustdoc::private-intra-doc-links' -C metadata=988cd26e30152c2f -L dependency=/opt/rustwide/target/debug/deps --extern derive_more=/opt/rustwide/target/debug/deps/libderive_more-de38e6bfcf24a584.so --extern rand=/opt/rustwide/target/debug/deps/librand-660afc33a0845390.rmeta --extern cracking=/opt/rustwide/target/debug/deps/libcracking-1f684f2b9e12d9be.rmeta --cap-lints=warn --crate-version 0.1.0` (signal: 9, SIGKILL: kill)
[INFO] [stderr] error: could not document `rust-solutions`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name ch4_p4_check_balanced src/bin/ch4-p4_check-balanced.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items '-Arustdoc::private-intra-doc-links' -C metadata=a3a46c25ff21fd96 -L dependency=/opt/rustwide/target/debug/deps --extern derive_more=/opt/rustwide/target/debug/deps/libderive_more-de38e6bfcf24a584.so --extern rand=/opt/rustwide/target/debug/deps/librand-660afc33a0845390.rmeta --extern cracking=/opt/rustwide/target/debug/deps/libcracking-1f684f2b9e12d9be.rmeta --cap-lints=warn --crate-version 0.1.0` (signal: 9, SIGKILL: kill)
[INFO] [stderr] error: could not document `rust-solutions`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name ch4_p8_first_common_ancestor src/bin/ch4-p8_first-common-ancestor.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items '-Arustdoc::private-intra-doc-links' -C metadata=c77df7dfd6f0ad00 -L dependency=/opt/rustwide/target/debug/deps --extern derive_more=/opt/rustwide/target/debug/deps/libderive_more-de38e6bfcf24a584.so --extern rand=/opt/rustwide/target/debug/deps/librand-660afc33a0845390.rmeta --extern cracking=/opt/rustwide/target/debug/deps/libcracking-1f684f2b9e12d9be.rmeta --cap-lints=warn --crate-version 0.1.0` (signal: 9, SIGKILL: kill)
[INFO] [stderr] error: could not document `rust-solutions`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name ch1_p2_urlify src/bin/ch1-p2_urlify.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items '-Arustdoc::private-intra-doc-links' -C metadata=18bf3eac6632a1e8 -L dependency=/opt/rustwide/target/debug/deps --extern derive_more=/opt/rustwide/target/debug/deps/libderive_more-de38e6bfcf24a584.so --extern rand=/opt/rustwide/target/debug/deps/librand-660afc33a0845390.rmeta --extern cracking=/opt/rustwide/target/debug/deps/libcracking-1f684f2b9e12d9be.rmeta --cap-lints=warn --crate-version 0.1.0` (signal: 9, SIGKILL: kill)
[INFO] [stderr] error: could not document `rust-solutions`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name ch3_p5_sort_stack src/bin/ch3-p5_sort-stack.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items '-Arustdoc::private-intra-doc-links' -C metadata=7229184086390c4b -L dependency=/opt/rustwide/target/debug/deps --extern derive_more=/opt/rustwide/target/debug/deps/libderive_more-de38e6bfcf24a584.so --extern rand=/opt/rustwide/target/debug/deps/librand-660afc33a0845390.rmeta --extern cracking=/opt/rustwide/target/debug/deps/libcracking-1f684f2b9e12d9be.rmeta --cap-lints=warn --crate-version 0.1.0` (signal: 9, SIGKILL: kill)
[INFO] [stderr] error: could not document `rust-solutions`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name ch1_p8_zero_matrix src/bin/ch1-p8_zero-matrix.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items '-Arustdoc::private-intra-doc-links' -C metadata=ecddb24fa32556e8 -L dependency=/opt/rustwide/target/debug/deps --extern derive_more=/opt/rustwide/target/debug/deps/libderive_more-de38e6bfcf24a584.so --extern rand=/opt/rustwide/target/debug/deps/librand-660afc33a0845390.rmeta --extern cracking=/opt/rustwide/target/debug/deps/libcracking-1f684f2b9e12d9be.rmeta --cap-lints=warn --crate-version 0.1.0` (signal: 9, SIGKILL: kill)
[INFO] [stderr] error: could not document `rust-solutions`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name ch1_p4_palindrom_permutation src/bin/ch1-p4_palindrom-permutation.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items '-Arustdoc::private-intra-doc-links' -C metadata=c90f811dcd8ee6b8 -L dependency=/opt/rustwide/target/debug/deps --extern derive_more=/opt/rustwide/target/debug/deps/libderive_more-de38e6bfcf24a584.so --extern rand=/opt/rustwide/target/debug/deps/librand-660afc33a0845390.rmeta --extern cracking=/opt/rustwide/target/debug/deps/libcracking-1f684f2b9e12d9be.rmeta --cap-lints=warn --crate-version 0.1.0` (signal: 9, SIGKILL: kill)
[INFO] [stderr] error: could not document `rust-solutions`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name ch5_p6_conversion src/bin/ch5-p6_conversion.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items '-Arustdoc::private-intra-doc-links' -C metadata=b78cae58fb060655 -L dependency=/opt/rustwide/target/debug/deps --extern derive_more=/opt/rustwide/target/debug/deps/libderive_more-de38e6bfcf24a584.so --extern rand=/opt/rustwide/target/debug/deps/librand-660afc33a0845390.rmeta --extern cracking=/opt/rustwide/target/debug/deps/libcracking-1f684f2b9e12d9be.rmeta --cap-lints=warn --crate-version 0.1.0` (signal: 9, SIGKILL: kill)
[INFO] [stderr] error: could not document `rust-solutions`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name ch5_p7_pairwise_swap src/bin/ch5-p7_pairwise-swap.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items '-Arustdoc::private-intra-doc-links' -C metadata=3376012aabfa2bc3 -L dependency=/opt/rustwide/target/debug/deps --extern derive_more=/opt/rustwide/target/debug/deps/libderive_more-de38e6bfcf24a584.so --extern rand=/opt/rustwide/target/debug/deps/librand-660afc33a0845390.rmeta --extern cracking=/opt/rustwide/target/debug/deps/libcracking-1f684f2b9e12d9be.rmeta --cap-lints=warn --crate-version 0.1.0` (signal: 9, SIGKILL: kill)
[INFO] [stderr] error: could not document `rust-solutions`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name ch2_p4_partition src/bin/ch2-p4_partition.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items '-Arustdoc::private-intra-doc-links' -C metadata=23da433561b91286 -L dependency=/opt/rustwide/target/debug/deps --extern derive_more=/opt/rustwide/target/debug/deps/libderive_more-de38e6bfcf24a584.so --extern rand=/opt/rustwide/target/debug/deps/librand-660afc33a0845390.rmeta --extern cracking=/opt/rustwide/target/debug/deps/libcracking-1f684f2b9e12d9be.rmeta --cap-lints=warn --crate-version 0.1.0` (signal: 9, SIGKILL: kill)
[INFO] [stderr] error: could not document `rust-solutions`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name ch2_p6_check_palindrome src/bin/ch2-p6_check-palindrome.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items '-Arustdoc::private-intra-doc-links' -C metadata=5b931b1a6069e75f -L dependency=/opt/rustwide/target/debug/deps --extern derive_more=/opt/rustwide/target/debug/deps/libderive_more-de38e6bfcf24a584.so --extern rand=/opt/rustwide/target/debug/deps/librand-660afc33a0845390.rmeta --extern cracking=/opt/rustwide/target/debug/deps/libcracking-1f684f2b9e12d9be.rmeta --cap-lints=warn --crate-version 0.1.0` (signal: 9, SIGKILL: kill)
[INFO] [stderr] error: could not document `rust-solutions`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name ch3_p4_queue_via_stacks src/bin/ch3-p4_queue-via-stacks.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items '-Arustdoc::private-intra-doc-links' -C metadata=435c16979f20137f -L dependency=/opt/rustwide/target/debug/deps --extern derive_more=/opt/rustwide/target/debug/deps/libderive_more-de38e6bfcf24a584.so --extern rand=/opt/rustwide/target/debug/deps/librand-660afc33a0845390.rmeta --extern cracking=/opt/rustwide/target/debug/deps/libcracking-1f684f2b9e12d9be.rmeta --cap-lints=warn --crate-version 0.1.0` (signal: 9, SIGKILL: kill)
[INFO] [stderr] error: could not document `rust-solutions`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name ch4_p2_minimal_tree src/bin/ch4-p2_minimal-tree.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items '-Arustdoc::private-intra-doc-links' -C metadata=9cd0f0793402003d -L dependency=/opt/rustwide/target/debug/deps --extern derive_more=/opt/rustwide/target/debug/deps/libderive_more-de38e6bfcf24a584.so --extern rand=/opt/rustwide/target/debug/deps/librand-660afc33a0845390.rmeta --extern cracking=/opt/rustwide/target/debug/deps/libcracking-1f684f2b9e12d9be.rmeta --cap-lints=warn --crate-version 0.1.0` (signal: 9, SIGKILL: kill)
[INFO] [stderr] error: could not document `rust-solutions`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name ch7_p6_jigsaw src/bin/ch7-p6_jigsaw.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items '-Arustdoc::private-intra-doc-links' -C metadata=b5b140e7437275db -L dependency=/opt/rustwide/target/debug/deps --extern derive_more=/opt/rustwide/target/debug/deps/libderive_more-de38e6bfcf24a584.so --extern rand=/opt/rustwide/target/debug/deps/librand-660afc33a0845390.rmeta --extern cracking=/opt/rustwide/target/debug/deps/libcracking-1f684f2b9e12d9be.rmeta --cap-lints=warn --crate-version 0.1.0` (signal: 9, SIGKILL: kill)
[INFO] [stderr] error: could not document `rust-solutions`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name ch3_p1_three_in_one src/bin/ch3-p1_three-in-one.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items '-Arustdoc::private-intra-doc-links' -C metadata=0f18fce1d9eeba78 -L dependency=/opt/rustwide/target/debug/deps --extern derive_more=/opt/rustwide/target/debug/deps/libderive_more-de38e6bfcf24a584.so --extern rand=/opt/rustwide/target/debug/deps/librand-660afc33a0845390.rmeta --extern cracking=/opt/rustwide/target/debug/deps/libcracking-1f684f2b9e12d9be.rmeta --cap-lints=warn --crate-version 0.1.0` (signal: 9, SIGKILL: kill)
[INFO] [stderr] error: could not document `rust-solutions`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name ch7_p2_call_center src/bin/ch7-p2_call-center.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items '-Arustdoc::private-intra-doc-links' -C metadata=19d994202a3861e5 -L dependency=/opt/rustwide/target/debug/deps --extern derive_more=/opt/rustwide/target/debug/deps/libderive_more-de38e6bfcf24a584.so --extern rand=/opt/rustwide/target/debug/deps/librand-660afc33a0845390.rmeta --extern cracking=/opt/rustwide/target/debug/deps/libcracking-1f684f2b9e12d9be.rmeta --cap-lints=warn --crate-version 0.1.0` (signal: 9, SIGKILL: kill)
[INFO] [stderr] error: could not document `rust-solutions`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name ch4_p6_successor src/bin/ch4-p6_successor.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items '-Arustdoc::private-intra-doc-links' -C metadata=6ff1f9f233d9fb1b -L dependency=/opt/rustwide/target/debug/deps --extern derive_more=/opt/rustwide/target/debug/deps/libderive_more-de38e6bfcf24a584.so --extern rand=/opt/rustwide/target/debug/deps/librand-660afc33a0845390.rmeta --extern cracking=/opt/rustwide/target/debug/deps/libcracking-1f684f2b9e12d9be.rmeta --cap-lints=warn --crate-version 0.1.0` (signal: 9, SIGKILL: kill)
[INFO] [stderr] error: could not document `rust-solutions`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name ch4_p7_build_order src/bin/ch4-p7_build-order.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items '-Arustdoc::private-intra-doc-links' -C metadata=2fbbaa67d263b90c -L dependency=/opt/rustwide/target/debug/deps --extern derive_more=/opt/rustwide/target/debug/deps/libderive_more-de38e6bfcf24a584.so --extern rand=/opt/rustwide/target/debug/deps/librand-660afc33a0845390.rmeta --extern cracking=/opt/rustwide/target/debug/deps/libcracking-1f684f2b9e12d9be.rmeta --cap-lints=warn --crate-version 0.1.0` (signal: 9, SIGKILL: kill)
[INFO] [stderr] error: could not document `rust-solutions`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name ch7_p5_online_book_reader src/bin/ch7-p5_online-book-reader.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items '-Arustdoc::private-intra-doc-links' -C metadata=9034fae445528073 -L dependency=/opt/rustwide/target/debug/deps --extern derive_more=/opt/rustwide/target/debug/deps/libderive_more-de38e6bfcf24a584.so --extern rand=/opt/rustwide/target/debug/deps/librand-660afc33a0845390.rmeta --extern cracking=/opt/rustwide/target/debug/deps/libcracking-1f684f2b9e12d9be.rmeta --cap-lints=warn --crate-version 0.1.0` (signal: 9, SIGKILL: kill)
[INFO] [stderr] error: could not document `rust-solutions`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name ch4_p1_route_between_nodes src/bin/ch4-p1_route-between-nodes.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items '-Arustdoc::private-intra-doc-links' -C metadata=aed0ac462cc245eb -L dependency=/opt/rustwide/target/debug/deps --extern derive_more=/opt/rustwide/target/debug/deps/libderive_more-de38e6bfcf24a584.so --extern rand=/opt/rustwide/target/debug/deps/librand-660afc33a0845390.rmeta --extern cracking=/opt/rustwide/target/debug/deps/libcracking-1f684f2b9e12d9be.rmeta --cap-lints=warn --crate-version 0.1.0` (signal: 9, SIGKILL: kill)
[INFO] [stderr] error: could not document `rust-solutions`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name ch4_p9_bst_sequences src/bin/ch4-p9_bst-sequences.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items '-Arustdoc::private-intra-doc-links' -C metadata=26eba632d0781b82 -L dependency=/opt/rustwide/target/debug/deps --extern derive_more=/opt/rustwide/target/debug/deps/libderive_more-de38e6bfcf24a584.so --extern rand=/opt/rustwide/target/debug/deps/librand-660afc33a0845390.rmeta --extern cracking=/opt/rustwide/target/debug/deps/libcracking-1f684f2b9e12d9be.rmeta --cap-lints=warn --crate-version 0.1.0` (signal: 9, SIGKILL: kill)
[INFO] [stderr] error: could not document `rust-solutions`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name ch4_p12_paths_with_sum src/bin/ch4-p12_paths-with-sum.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items '-Arustdoc::private-intra-doc-links' -C metadata=6d3d64ac8623701c -L dependency=/opt/rustwide/target/debug/deps --extern derive_more=/opt/rustwide/target/debug/deps/libderive_more-de38e6bfcf24a584.so --extern rand=/opt/rustwide/target/debug/deps/librand-660afc33a0845390.rmeta --extern cracking=/opt/rustwide/target/debug/deps/libcracking-1f684f2b9e12d9be.rmeta --cap-lints=warn --crate-version 0.1.0` (signal: 9, SIGKILL: kill)
[INFO] [stderr] error: could not document `rust-solutions`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name ch5_p2_binary_to_string src/bin/ch5-p2_binary-to-string.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items '-Arustdoc::private-intra-doc-links' -C metadata=44aedd0a530635f8 -L dependency=/opt/rustwide/target/debug/deps --extern derive_more=/opt/rustwide/target/debug/deps/libderive_more-de38e6bfcf24a584.so --extern rand=/opt/rustwide/target/debug/deps/librand-660afc33a0845390.rmeta --extern cracking=/opt/rustwide/target/debug/deps/libcracking-1f684f2b9e12d9be.rmeta --cap-lints=warn --crate-version 0.1.0` (signal: 9, SIGKILL: kill)
[INFO] [stderr] error: could not document `rust-solutions`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name ch5_p5_debugger src/bin/ch5-p5_debugger.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items '-Arustdoc::private-intra-doc-links' -C metadata=b5fb5fdb474c0d93 -L dependency=/opt/rustwide/target/debug/deps --extern derive_more=/opt/rustwide/target/debug/deps/libderive_more-de38e6bfcf24a584.so --extern rand=/opt/rustwide/target/debug/deps/librand-660afc33a0845390.rmeta --extern cracking=/opt/rustwide/target/debug/deps/libcracking-1f684f2b9e12d9be.rmeta --cap-lints=warn --crate-version 0.1.0` (signal: 9, SIGKILL: kill)
[INFO] [stderr] error: could not document `rust-solutions`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name ch1_p3_check_permutation src/bin/ch1-p3_check-permutation.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items '-Arustdoc::private-intra-doc-links' -C metadata=f7ba418d10e89a56 -L dependency=/opt/rustwide/target/debug/deps --extern derive_more=/opt/rustwide/target/debug/deps/libderive_more-de38e6bfcf24a584.so --extern rand=/opt/rustwide/target/debug/deps/librand-660afc33a0845390.rmeta --extern cracking=/opt/rustwide/target/debug/deps/libcracking-1f684f2b9e12d9be.rmeta --cap-lints=warn --crate-version 0.1.0` (signal: 9, SIGKILL: kill)
[INFO] [stderr] error: could not document `rust-solutions`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name ch2_p3_delete_middle_node src/bin/ch2-p3_delete-middle-node.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items '-Arustdoc::private-intra-doc-links' -C metadata=3ea1c150f493050b -L dependency=/opt/rustwide/target/debug/deps --extern derive_more=/opt/rustwide/target/debug/deps/libderive_more-de38e6bfcf24a584.so --extern rand=/opt/rustwide/target/debug/deps/librand-660afc33a0845390.rmeta --extern cracking=/opt/rustwide/target/debug/deps/libcracking-1f684f2b9e12d9be.rmeta --cap-lints=warn --crate-version 0.1.0` (signal: 9, SIGKILL: kill)
[INFO] running `Command { std: "docker" "inspect" "226494b560d4a066ef519030bcd20dd223d316d4296a779f9771265eb0bdf5ea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "226494b560d4a066ef519030bcd20dd223d316d4296a779f9771265eb0bdf5ea", kill_on_drop: false }`
[INFO] [stdout] 226494b560d4a066ef519030bcd20dd223d316d4296a779f9771265eb0bdf5ea